BOTH INTERNATIONAL & INLAND Which vessel is required to display a high intensity all-round flashing red light?

Correct Answer: Option C — a WIG craft

Rule 23(b) specifically requires a Wing-in-Ground (WIG) craft to display a high-intensity all-round flashing red light when taking off, landing, or in flight near the surface. This light serves as a warning to other vessels of the WIG craft's presence and its high-speed, low-altitude operational state.